Drop attacks stem from diverse mechanisms, including orthopedic causes (for example, leg weakness and knee instability), hemodynamic causes (for example, transient vertebrobasilar insufficiency, a type of interruption of blood flow to the brain), and neurologic causes (such as epileptic seizures or unstable vestibular function), among other reasons ...
ËpÃ¦l i-) adj. (sometimes l.c.) of, designating, or characteristic of the early phase of the Stone Age: usu. divided into three periods (Lower Paleolithic, c2,000,000âc200,000 b.c., Middle Paleolithic, c150,000âc40,000 b.c., Upper Paleolithic, c40,000âc10,000 b.c.).
The Palaeolithic, (or Paleolithic), refers to the prehistoric period when stone tools were made by humans. They are found in the Great Rift Valley of Africa from about 3.3 million years ago. They were probably made by Australopithecines. They are found in Europe somewhat later, from about 1 mya (0.7mya for Britain).